Feliz Navidad - harmonica lesson with tabs ('I Wanna Wish You a Merry Christmas' by Jose Feliciano) - YouTube
50 Great songs to play on harmonica - audio clips and full lessons
Customisation - optimising or tuning to different notes or intonation - £30.00
Amazon.com: Harmonica for Kids and Adults, Beginners Blues Harmonica Mouth Organ in the Key of C, 10 Holes 20 Notes Diatonic Harp Musical Instrument with Storage Bag and Cleaning Cloth by SMALL
Exploring the 3 Types of Harmonica – A Beginner's Guide